java - try and catch 语句没有给我结果？

Question

**代码的目的是从文件中读取一些数据。数据被分割成几行，每行上的数据使用“-”字符分割。该代码应将数据拆分为单独的字符串，并将单独的字符串传输到名为“splitLine”的数组中。测试数据的要点是它抛出一个“ArrayIndexOutOfBoundsException”。但是，在给出此异常后，catch 应该只允许代码继续运行，但它不起作用。 **

public class asd 

{

    public static void main(String[] args)
    {
        String line = "";
        String[] splitLine;
        Scanner keyboard = new Scanner (System.in);
        System.out.print("Enter the file name: ");
        String filename = keyboard.nextLine();

        Scanner fileReader = null;

        try
        {
            File Fileobject = new File (filename);
            fileReader = new Scanner (Fileobject);
            System.out.println("The file " + filename + " contains the following lines");
            System.out.println("==============================");
            int x=0;




            while(fileReader.hasNext())
            { 
                try 
                {
                    line = fileReader.nextLine();
                    splitLine = line.split(" - "); //For assignment use line.split(" - ")
                    System.out.printf("Title: %20s \nAuthor: %17s \nPublisher: %9s\nPrice: %10s\nPages: %8s\nISBN: %16s\n===================\n", splitLine[x] , splitLine[x+1], splitLine[x+2], splitLine[x+3], splitLine[x+4], splitLine[x+5]);
                } 
                catch (ArrayIndexOutOfBoundsException  e) 
                {
                    continue;
                }





        }
    }
        catch(FileNotFoundException e)
            {
                System.out.println("Error - file does not exist");
                System.exit(0);
            } 

    }
}

Answer 1

我建议在访问输入之前对其进行验证，而不仅仅是使用它并在出现异常时失败。

<小时/>

另一个方向:

无论如何 - 根据您的消息，您的数据是用“-”组织的，那么为什么不将相同的数据保存为 JSON 文件呢？

然后你可以像这样将它读取到你的对象中:首先，创建您自己的 Article.java 类然后，编写如下代码:

import com.fasterxml.jackson.*

    public static void someMethod()
    {
        File file = new File("....somepath...\\Desktop\\data.json");
        ObjectMapper mapper = new ObjectMapper();
        Article article = mapper.readValue(file , Article.class);

        System.out.printf("Title: %20s \nAuthor: %17s \nPublisher: %9s\nPrice: %10s\nPages: %8s\nISBN: %16s\n===================\n", article.getTitle(), article.getPublisher(), article.getPrice(), article.getPages(), article.getSomethingMore1(), article.getSomethingMore2());

    }